Journal
SMALL
Volume 14, Issue 8, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201703274
Keywords
chemical enhancement; facet-dependent interfacial charge transfer; SERS; surface electronic work function
Categories
Funding
- National Natural Science Foundation of China [21601009, 51532001]
- Fundamental Research Funds for the Central Universities [KG12007201]
- MOE [RG2/16]
- Academic Excellence Foundation of BUAA
- International Postdoctoral Exchange Fellowship Program
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Semiconductor-based surface enhanced Raman scattering (SERS) has attracted great attention due to its excellent spectral reproducibility, high uniformity, and good anti-interference ability. However, its relatively low SERS sensitivity still hinders its further developments in both performance and applications. Since the SERS is a peculiar surface effect, investigating the facet-dependent SERS activity of semiconductor nanostructures is crucial to boost their SERS signals. Although the semiconductor facet-dependent SERS effect is predicted via numerical calculations, convincing experimental evidence is scarce due to complicated and undefined surface conditions. In this work, three facet-defined ({100}, {110}, and {111} facets) Cu2O microcrystals (MCs) with clear surface atomic configuration are utilized to investigate the facet-dependent SERS effect. The results from the Kelvin probe force microscopy measurements on single Cu2O polyhedron, demonstrate that the facet-dependent work function plays a crucial role in the interfacial charge transfer process. Comparing with the {110} and {111} facets, the {100} facet possesses the lowest electronic work function, which enables more efficient interfacial charge transfer. The simulation results further confirm that the {100}-facets can transfer the most electrons from Cu2O MCs to molecules due to its lowest facet work function, resulting in the largest increment of the molecular polarization.
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